BRUSHLESS ALTERNATING CURRENT GENERATOR

• US 3,676,764 A
• Filed: 01/29/1971
• Issued: 07/11/1972
• Est. Priority Date: 01/29/1971
• Status: Expired due to Term

• Current Assignee: Charles D. Syverson
• Original Assignee: Charles D. Syverson
• Inventors: Syverson, Charles D.
• Primary Examiner(s): Myers, Lewis H.
• Assistant Examiner(s): Huberfeld, H.
• Application Number:
  US05/111,124
• Time in Patent Office: 529 Days
• Field of Search: 322/51,59,60,61,62,52 310/187,198
• US Class Current: 322/51
• CPC Class Codes: H02K 19/38 Structural association of synchronous generators with exciting machines
• CPC Class Codes: H02P 9/38 Self-excitation by current derived from rectification of both output voltage and output current of generator

Abstract

A self-excited brushless alternating current generator utilizes a four-pole direct current excitation winding wound on a stator and operable to generate an exciter flux which induces an alternating current in a field excitation winding wound on a rotor. The field excitation winding connects through rectifiers to a d-c main field winding also wound on the rotor. The main field winding generates a main field flux which induces an alternating current in a two-pole a-c output winding wound on the stator. No brushes are required and the excitor windings are wound on the same magnetic core with the generator windings.

Claims

1. An alternating current generator the combination comprising:

a magnetic core having a stator and a rotor;

an a-c output winding wound on the stator of said magnetic core and having a fixed number of poles;

a d-c main field winding wound on the rotor of said magnetic core and operable to induce an alternating current in said a-c output winding when the rotor is rotated and a direct current is supplied to the d-c main field winding;

a rectifier circuit mounted on said rotor and connected to conduct direct current to said d-c main field winding when supplied with an alternating current;

a d-c excitation winding wound on the stator of said magnetic core and having twice as many poles as said a-c output winding; and

a field excitation winding wound on the rotor of said magnetic core, connected to said rectifier circuit, and operable to generate an alternating current to said rectifier circuit when the rotor is rotated and the d-c excitation winding is supplied with direct current.

2. The alternating current generator as recited in claim 1, wherein the poles of said a-c output winding are equally spaced around the axis of rotation of said rotor, and the poles of said d-c excitation winding are equally spaced around the axis of rotation of said rotor.

3. The alternating current generator as recited in claim 2, wherein the poles of said a-c output winding are in alignment with poles of said d-c excitation winding.

4. The alternating current generator as recited in claim 2, wherein the rotor of said magnetic core has a pair of pole pieces and said d-c main field winding has two poles aligned with said pole pieces.

5. The alternating current generator as recited in claim 4, wherein said field excitation winding is comprised of a plurality of phase windings connected to generate a polyphase alternating current to said rectifier circuit.

6. The alternating current generator as recited in claim 5, wherein said phase windings each have a pair of poles and the resulting poles of said field excitation winding are asymmetrically arranged around the axis of rotation of said rotor.